nugent



UNITED STATES EXAMINER (wh t's PATENT OFFICE.

JOSEPH J. NIGENT, OF MERRILL, WISCONSIN, ASSIGNOR OF ONE-HALF TO EDWARD F. VAN IIOOTEGEM, OF SAME PLACE.

COMPOSITION FOR BLACKBOA RDS.

SPECIFICATION forming part of Letters Patent No. 62 5,894, dated May 30, 1899.

Application filed April1,1899. Serial N0. 711,381. \No spccimcnsd To a]? 114mm, 7'! may (on (1 771 Be it. known that I, .Iosnrn J. NUGENT, a citizen of the United States, residing at Merrill, in the county of Lincoln and State of 5 isconsin, have invented a certain new and useful Improvement in a Composition for Blackboa-rds, of which the following is a specification.

Myinvention relates to improvements in a compound for blackboards; and it consists of the following ingredients in about the proportions given: lime slaked to a putty consistency, one hundred pounds; pccoria black s llll, twentyfive pounds; groum quartzs c\' No.0000,twentypounds; ground uart.-

s ex fil-IOO thirteen pounds; ground uartzsilex SIX pounds; lastcr-of iaris or -y pounds; cement, eigiiieeu pounds; glue, six ounces.

In compoundingthcingrcdients I take lime and slake it to about a putty consistency as a basis,t0 which I add the three grades of ground quartz-silex and thoroughly mix them while the lime is still warm from the slaking process. \Vhen this mixture is cold, the pecoria black stain is added and thoroughly mixed. 'lheseingredient-s can be mixed ready for use and, if desired, sealed up; but the plasterof-paris, cement, and glue should not be added until it is desired to use the compound for making a blackboard.

When the operator is ready to produce the blackboard, the glue, plastcr-of-paris, and cement are dissolved and mixed with water and added to the othcringred tents. Foriustance,

s 2. .l the plasterer will take about as much of the first mixture as he can handle-say twentyiivc pounds. Ile then should add to four quarts of water one and ouchalf ounces of glue. The dissolved glue, with ten pounds of plastcrof-paris and four and one-half pounds of cement, is then added to the twentytive pounds of the composition and thoroughly mixed. The compound is then complete and ready for use.

A blackboard composition composed of the above ingredients produces a superior blackboard-surfacc which can be applied to the wall like plastering, to a board, or to a wirenetting, as desired.

The composition is cheap to produce, as well as superior in quality.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. A compound for blackboards consisting of slaked lime, ground quartz, black stain, glue, cement and plaster-of-paris, substantially as described.

2. A compound forblackboards consisting of slaked lime, a plurality of grades of quartzsilex, black stain, glue, cement and plasterof-paris substantially as described.

In testimony whereof Iaitix my signature in presence of two witnesses.

JOSEPH J. NUGENT.

Witnesses:

JOHN VAN IIECKE, E. E. WEIsE. 

